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參數(shù)資料
| 型號： | MAX2036CCQ+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VGA W/OCTAL MIXER 8CH 100TQFP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 90 |
| 放大器類型： | 可變增益 |
| 電路數(shù)： | 8 |
| 輸出類型： | 差分 |
| -3db帶寬： | 2MHz |
| 電流 - 電源： | 245mA |
| 電流 - 輸出 / 通道： | 3.75mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-TQFP 裸露焊盤 |
| 供應商設備封裝： | 100-TQFP-EP（14x14） |
| 包裝： | 托盤 |
Applications Information
Mode Select Response Time
The mode select response time is the time that the
device takes to switch between CW and VGA modes.
One possible approach to interfacing the CW outputs to
an instrumentation amplifier used to drive an ADC is
shown in Figure 2. In this implementation, there are four
large-value (in the range of 470nF to 1F) capacitors
between each of the CW_IOUT+, CW_IOUT-,
CW_QOUT+, CW_QOUT- outputs and the circuitry they
are driving. The output of the CW mixer usually drives
the input of an instrumentation amplifier made up of op
amps whose input impedance is set by common-mode
setting resistors.
There are clearly both a highpass corner and a lowpass
corner present in this output network. The lowpass cor-
ner is set primarily by the 115
mixer pullup resistors,
the series 50
resistors, and the shunt 0.022F capaci-
tor. This lowpass corner is used to filter a combination
of LO leakage and upper sideband. The highpass cor-
ner, however, is of a larger concern due to the fact that
it is dominated by the combination of a 1F DC blocking
capacitor and the pair of shunt 31.6k
resistors.
If drawn, the simplified dominant highpass network
would look like Figure 3.
The highpass pole in this case is at fP = 1/(2 x pi x
RC) ~ 5Hz. Note that this low highpass corner frequen-
cy is required in order to filter the downconverted clut-
ter tone, which appears at DC, but not interfere with
CWD imaging at frequencies as low as 400Hz. For
example, if one wanted to use CWD down to 400Hz,
then a good choice for the highpass pole would be at
least a decade below this (< 40Hz) as not to incur
rolloff due to pole. Remember, if the highpass pole is
set to 400Hz, the response is 3dB down at that corner
frequency. The placement of the highpass pole at 5Hz
in the above example is between the DC and 40Hz limi-
tations just discussed.
The bottom line is that any reasonably sized DC block
between the output of the mixer and the instrumentation
amplifier pose a significant time constant that slows the
mode select switching speed.
An alternative solution to the approach in Figure 2,
which enables faster mode select response time, is
shown in Figure 4.
In Figure 4, the outputs of the CWD mixers are DC-
coupled into the inputs of the instrumentation ampli-
fiers. Therefore, the op amps must be able to accom-
modate the full compliance range of the mixer outputs,
which is a maximum of +11V when the mixers are dis-
abled, down to the +5V supply of the MAX2036 when
the mixers are enabled. The op amps can be powered
from +11V for the high rail and +5V for the low rail,
requiring a 6V op amp.
MAX2036
Ultrasound VGA Integrated
with CW Octal Mixer
______________________________________________________________________________________
19
115
115
1
F
1
F
0.022
F
31.6k
31.6k
50
CW_IOUT+
CW_IOUT-
Figure 2. Typical Example of a CW Mixer’s Output Circuit
1
F
31.6k
Figure 3. Simplified Circuit of Highpass Pole
+11V
+5V
Figure 4. Improved Mode Select Response Time Achieved with
DC-Coupled Input to Instrumentation Amplifier
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相關代理商/技術參數(shù) |
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|---|---|
| MAX2036CCQ+ | 功能描述:儀表放大器 Ultrasound Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| MAX2036CCQ+D | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX2036CCQ+T | 功能描述:儀表放大器 Ultrasound Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| MAX2036CCQ+TD | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultrasound VGA Integrated with CW Octal Mixer |
| MAX2036EVKIT | 制造商:Maxim Integrated Products 功能描述:ULTRASOUND VARIABLE-GAIN AMPLIFIER WITH CWD (10B COMPATIBLE - Boxed Product (Development Kits) |
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